Operating Instructions for ERU Knife Gate Valve K1 with electric actuator
4
Performance and Mode of Operation
ERU Knife Gate Valves K1 are wafer-type single-door gate valves with short face-to-
face dimension. A special type of these valves, e.g. with regulating orifice, is also
suitable for regulating purposes. The solid gate slides in a long gate guide between
two body components. It seals on its periphery against a rubber-resilient, steel-
reinforced, enclosed U-shaped sealing element. Where the gate leaves the body,
tightness to the outside is ensured by a resiliently prestressed profile seal which can
be readjusted. For reducing wear and tear of the profile seal and the actuating
elements the prestress can be reduced to the dimension required for the actual
operating pressure.
The Gate Valves were tested for tightness and resistance to DIN EN12266 and
DIN EN1074 at the manufacturer's plant. They are designed for flow acting from any
direction.
ERU Knife Gate Valves K1 are disconnected in a travel-dependent manner in closing
and opening directions. The limit positions "OPEN" and "CLOSED" are signalled by
the travel switches. Running against or jamming at the upper mechanical stop of the
valve due to motor after-running is avoided. The torque switches serve as safety
switches in opening and closing directions.
ERU Knife Gate Valves K1 are switched in a travel dependent manner in closing and
opening directions.
4.1
Retrofitting of an Electric Multi-Turn Actuator
If the valve is supplied without incorporated electric actuator, the torque and travel
switches have to be set as follows after mounting the electric actuator:
4.1.1. Move the valve manually in central position and check the direction of rotation of
the motor by means of short switching impulses - if necessary, change the
poles of the motor connection. The valve closes when turning the handwheel in
clockwise direction.
4.1.2. Set the torque switches to the torques specified in the enclosed drawings.
4.1.3. Move the valve manually in open position against the upper mechanical limit
stop. Then, move the handwheel by 10 turns in closing direction and adjust the
"OPEN" travel switch.
4.1.4. Move the valve manually in closed position and adjust the "CLOSED" travel
switch.
BA46E033
July 2005
Rev. 4
ERHARD-Armaturen
x
D-89502 Heidenheim
x
Postfach 1280
(07321) 320-0
(07321) 320 491 e-mail:info
@
erhard.de
Internet: http://www.erhard.de
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